In one narration the wording is: The Prophet (peace and blessings be upon him) said: "Give us something to eat!" I presented a few handfuls of dates to the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said: "O Bilal, give more." I presented more three times. I said: "Now only that which I had stored away for the Messenger of Allah remains." The Prophet (peace and blessings be upon him) said: "Spend, and do not fear any shortage from the Owner of the Throne."
Al-Tabarani recorded it in al-Mu'jam al-Kabir. The first narration contains a narrator, Muhammad bin al-Hasan bin Zabalah, and the second contains Talhah bin Zayd al-Qurashi, and both of them are da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الزكاة / 4699